Thank you for your invitation. The software required for US appearance patent drawings is CDR, AI or CAD software. You need to have a little foundation in aesthetics, be familiar with the surface characteristics of the product, and be able to clearly express the relationship between the surface characteristics of the product. When drawing, you need to pay attention to the relationship between the line width of the hatch line and the outline line, and there are also details such as dotted lines in some places, which cannot be explained clearly in a few words. If you want to know more about what you want to do, you should read more relevant information. I hope it can help you!